Agreed.
 
But is it even possible to run fencing on a w*dows system?
 
/A
-------------------------------------------
Andreas Lundgren
Technical Account Manager | Steria AB
Karlsrov 2D, Box 544, SE-182 15 Danderyd, Sweden
Mobile: +46-709-214381
Email: [EMAIL PROTECTED]

[EMAIL PROTECTED] wrote: -----

To: "Shashi Kanth Boddula" <[EMAIL PROTECTED]>, "Mayank Vasa" <[EMAIL PROTECTED]>
From: "Jim Senicka" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
Date: 2008-06-12 17:33
cc: veritas-ha@mailman.eng.auburn.edu
Subject: Re: [Veritas-ha] vxfencing >2 nodes

For any cluster larger than 1 node, I/O fencing is highly recommended to
protect data integrity in the event of a split brain.
2 nodes is not in any way more resistant to split brain than 3 nodes or
more.


VCS does not use any form of quorum based membership (quorum has a
number of it's own ugly issues), so there is no difference in how our
membership works when you have 2, 3, or 32 nodes


-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of Shashi
Kanth Boddula
Sent: Thursday, June 12, 2008 7:30 AM
To: Mayank Vasa
Cc: veritas-ha@mailman.eng.auburn.edu
Subject: Re: [Veritas-ha] vxfencing >2 nodes

Ok, thanks for clarification.

I have seen many clustering products documentation which says that
fencing/quorum is optional/not_required for more than 2 node clusters,
and they says that there is very very less chance of happening split
brain condition for more than 2 node clusters.

-- Shashi

Mayank Vasa wrote:
> Shashi:
>
> The number of nodes is not a decision making factor for fencing. For a

> cluster greater than 2 nodes, fencing helps to protect your data in
> the case of a split brain scenario.
>
> SFRAC requires fencing. It is not supported without it.
>
> Regards,
> + Mayank
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]] On Behalf Of Shashi

> Kanth Boddula
> Sent: Wednesday, June 11, 2008 12:23 AM
> To: veritas-ha@mailman.eng.auburn.edu
> Subject: [Veritas-ha] vxfencing >2 nodes
>
> Is vxfencing required if we go for >=3 node cluster ?  Or, vxfencing
> is optional if we go for >=3 node cluster ?
>
>
> I am going for 4-node VCS5 SFRAC, still vxfencing required for me ? ,
> does all VCS5 SFRAC modules work properly without vxfencing ?
>
>
>
> _______________________________________________
> Veritas-ha maillist  -  Veritas-ha@mailman.eng.auburn.edu
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>
>  

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